Steam Boilers, Engines, Nozzles and Turbines
The impulse reaction turbine has its driving force

As a reaction force
None of the listed here
As an impulsive force
Partly as an impulsive force and partly as a reaction force

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Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Heat transfer area should be optimum
Handling and maintenance should be easier
Approach temperature should be as low as possible
Stack gases should not be cooled to the dew point

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